Merge pull request#113 from binbin0325/nacos_2.xupgrade nacos v2.x

update nacos v1 (#109)

fix slices length bug in AcquireBytes from bug from pr#108

update nacos version to 2.1.2 (#106)* support for nacos v2.1.0* mv nacos/v2 nacos* fix format* set nacos-sdk-go to 2.1.2 and client close func* update nacos port* client close and client set nil* fix data race* update test to assert* fix importCo-authored-by: bobtthp <bobtthp@bob-Mac-mini.local>Co-authored-by: bob <bob@bobdeMacBook-Pro.local>

change big decimal interface

move part of dubbogo common module to gost

check connection aliveness

add check connection aliveness

change conncheck.go license header format

check connection aliveness